Woodchucks live in underground tunnels such as the one shown below.

Woodchucks live in underground tunnels such as the one shown below. 

Woodchucks live in underground tunnels such as the one shown below. One opening has a dirt mound around it and air flows across it quickly. The other opening is even with the ground that air moves across it with less speed. How does this design help ventilate the tunnel?

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Woodchucks live in underground tunnels such as the one shown below. One opening has a dirt mound around it and air flows across it quickly. The other opening is even with the ground that air moves across it with less speed. How does this design help ventilate the tunnel?

AD:

HQD CUVIE PLUS | FUME EXTRA  HQD CUVIE AIR  |  FUME INFINITY  FUME ULTRA  MORE XXL VAPE  HQD VAPE  CUVIE PLUS 

CUVIE PLUS | FUME EXTRA VAPE  | CUVIE AIR  |  FUME INFINITY VAPE    | MORE XXL   | HQD   

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